Radio goniometer



NOV- 19, 19.40-A KARL-GEORG Hols'rEN ETIAL -I 2,221,946 4 RADIo'GoNIoMETER Filed June 14, 1939 i /nvenq/U: Karl-6emy Hola'ten Valter Jmtzel f UNITED STATES vfield coils.

Patented Nov. 19, 1940 I.

RADIO GoNIoMETER Karl-Georg Holsten and Walter Sclitzel, Berlin,

Germany, assignors to C. LorenzvAktiengesellschaft, Berlin-Tempelhoi, Lorenzweg Germany, al cmpahy Application June 14, 1939, Serial No. 279,010 In Germany June 22, 1938 v 1 Claim.

This invention relates to radio goniometers, and more particularly to new and useful structural designs for such devices. f

Radio goniometers adapted for use in radio direction finding receivers for ascertaining the `sense of direction of incoming electromagnetic ceive very short and ultra short Waves because of the fact that these turns must be so arranged as to involve a high degree of coupling between vthe eld coils and the search coil and, moreover,

for the purpose of eliminating direction finding errors to insure that the rate ofcoupling is caused to vary in accordance with a pure sine law in response to a rotation of the search coil relative to n the field coils. Experience teaches that it is very difficult to concurrently satisfy these two rev quency oscillations demand field coils and search quirements in the above mentioned ultrashort range of waves since the'corresponding high frecoils comprising a comparatively low number of turns which for electrical and mechanical reasons must be widely spaced apart from one' another. These widely spaced turns introduce a further drawback, namely, that the rate of coupling becomes subject to sudden andl uncontrollable changes when the winding planes of thev search coil in response to a rotation thereof move from one winding plane to lthe neighbouring winding plane of the field coils. Such a goniometer device does not induce a sine-shaped characteristic and due to 4the suddent leaps thereof is not useful for accurately'deterrnining the sense of direction of a signalling station.` f

It is the object of this invention to so dispose the field coils and/or thesearch coil of a radio goniometer as to obtain the ldesirable uniform characteristic of the rate of coupling between the two types of coils in response to a movement of the search coil relative `to the field coils. This is realized in accordance with the main feature 7 of this invention by obliquely disposing thel turns of one type of coils relative to those of the other type of coils.

The oblique relationship between the individual turns and, hence, winding planes of *the* stationary coils and those of the movable coil may be obtained in a variety of ways as will hereinafter be fully explained. l

(o1. 25o- 11) l,

The body 2 is fixedly attached to ra pivotally 10 mounted spindle 3 and lrotatable therewith. The individualv turns 5, 4, `6,. I and 8 of the search coil embodied are by Way of an example helically wound onto the supporting body 2 in the usual 15 manner, that is, substantially parallel with thev spindle 3, by neglecting the slight departure from this parallelism onaccount of the pitch of such helix. Now, according to the invention, the turns 9, I0, II, I2, I3, I4 and I5 of the field coilsshown are applied on the supporting member lobliquely with respect to the turns of the search coil.. vThis arrangement involves the' essential feature' that' the rate of coupling between the two coils is gradually changed with a movement of the search 25 coil relatively to the field coil so that the characteristic of coupling is caused to change in ac- .cordance with any desired predetermined law since no leaps or suddeny uncontrollablek changesl are set up as heretofore when the winding plane 30 vor planes of the search coil are moved from one lits turns 9*-I5 perpendicularly related to those of the rst mentioned field coil as shown in 4 l n Fig. 2.

The same beneficial result will be obtained if the field-coil or coils are so arranged on the supportingv body or bodies that their turns are substantially-in parallel with the rotatable spindle- 45 of the search coil, while" the turns of the last mentioned coil are disposed 'obliquely with respect .to those of the eld coil or coils.

It is likewise possible Without departing from r50 the scope of this invention to so arrange the turns of the i-leld coils and the search coil that none of the turns present parallelism with the rotatable spindle ofthe search coil, that is, toplace them f on their respective supporting bodies in such man- 55 2 ner that the winding planes form an angle therewith other than 90 degrees.

In addition to the beneficial properties of a radio goniometer as constructed in accordance with this invention, the further feature oi high degree of coupling between the eld coils and the Search coil is obtained by Virtue of the fact that the slantly disposed windings are capable of covering larger surfaces than the windings which are perpendicularly applied on their respective supporting bodies.

What is claimed is:

A radio goniometer coil assembly comprising, a hollow supporting body, a field coil formed by a number of substantially parallel wire turns disposed on the said body, a further supporting body positioned within the said first mentioned body, a rotatable Search coil formed by a number of wire turns applied substantially in parallel with each other on the said further body and obliquely with respect to the first mentioned parallel turns in all positions of rotation of said search coil, and a rotatable spindle xedly attached to the said search coil supporting body for angularly rotating the said Search coil relative to the said field coil.

KARL-GEORG HOLSTEN.

WALTER SCHTZEL. 

